The documents included Form 4868, which grants taxpayers a six-month extension to file their returns. The form listed the Romneys' estimated tax liability as $3.2 million, and stated that the family has already made payments of $3.4 million. A second form showed that the Romneys applied a payment of $887,000 toward estimated taxes when they filed for the extension.

A campaign spokeswoman said they will release their 2011 tax return when it is filed, presumably within the next six months. She also noted that the couple has filed for extensions in prior years as well.

For the 2010 tax year, the Romneys paid $3 million in taxes on $21.7 million in income.

As the April 17 tax deadline draws near, the Romneys aren't the only ones asking for more time to finish up their taxes. The IRS estimates that 10.4 million taxpayers filed for extensions last year.

President Barack Obama was also in the news for his taxes Friday, when he revealed his returns to the public -- after filing them before the tax deadline.

The Obama family reported paying $162,074 in federal taxes on an adjusted gross income of $789,674 for 2011. The family's annual income dropped by almost $1 million as sales from the president's best-selling books -- "Dreams from My Father," and "The Audacity of Hope" -- slowed.